Filters: Tags: Flowlines (X)
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This map service contains GIS data in NAD83 from the EPA Office of Water for the National Hydrography Dataset (NHD) integrated with reach-related information from the USEPA Reach File Version 3.0-Alpha release (RF3-Alpha). This service also includes hydrographic landmark features in NHD. It is available as a WMS, WFS and REST service as well as the native MapServer service. Details include symbology based on the NHD symbol set and labels for flowlines and waterbodies.
A crosswalk table between NHDPlus version 2.1 flowlines (using the unique field COMID) and the Watershed Boundary Dataset (WBD) 12-digit-hydrologic units (HU-12) is provided for the 48 contiguous United States. The crosswalk table provides a WBD HU-12 assignment for every networked flowline in the NHDPlus. In this way, the network developed for navigation and modeling, NHDPlus, is aligned with accounting units of the WBD HU-12s to the extent possible given the assumptions that were made in creating each. A crosswalk table for NHDPlus isolated sinks was produced by a simple overlay process where the sinks were assigned HU-12 values based on their position relative to the WBD snapshot HU-12s. This table was integrated...
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: COMID,
HUC12,
NHDPlus,
USGS Science Data Catalog (SDC),
WBD,
Patch importance provides a measure of how large, intact, and connected a “patch” of habitat is for each biome type. More “intact” patches are depicted using a more saturated (darker) color, whereas less intact have lighter, less saturated colors. Centrality flow lines depict the network of movement pathways that conceptually connect with the patches of a given biome type. Thicker and darker red lines indicate more central locations where more “movement flow” is predicted to occur, while the location of the lines depicts where the movement pathways are best placed to avoid places of high human activity.
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